Improvement in holders for chisels



J. RUSSELL.

' Holder for Chisels. No. 53,884. Patented April 10, 1866.

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UNITED STATES JOHN RUSSELL, OF SING SING, NEW YORK.

IMPROVEMENT IN HOLDERS FOR CHISELS.

Specification forming part of Letters Patent No. 53,884, dated April 10,1866.

To all whom it may concern:

Be it known that I, JOHN RUssELL, ofSing Sing, in the county ofWestchester and State of New York, have invented a new and usefulImprovement in the Construction of the Holders of Chisels Used inCutting Files and for Similar Purposes; and I do hereby declare that thefollowingis a full,clear, and exact de scription thereof, and of themode or manner of operation, reference being bad to the accompanyingdrawings, and to theletters of reference marked thereon, and making apart of this specification.

The nature of my improvement or invention consists in so constructingthe chisel-holder that, while it will firmly and steadily hold thechisel to receive the blows of the hammer, it will at the same timeallow of such variation in the position of the chisel in the holder thatthe chisel can adapt itself to any inequalities there may be in thesurface of the blank to be cut, and by which also the machinery isgreatly relieved from theshock of the blows upon the chisel.

Figure 1 is a perspective view of the chiselholder with the chisel inposition. Fig. 2 is a vertical sectional View of Fig. 1 with the chiselremoved. Figs. 3 and at are views of the inside surfaces of the jaws ofthe chisel-holder.

The same letters refer to like parts in the several figures.

The chisel A is held between the jaws or plates B and O, and is fastenedtherein by means of the set-screw D. The chisel and its holder areconnected with the machineryor to any place desired by the screw E.

To the inner face of thejaw or plate B, Ifix a piece of india-rubber,gutta-percha, or other similar elastic .or yielding material, F, and tothe inner end of the screw D, or to that part of the inner face of thejaw or plate 0 which is moved and worked by such screw D, I also fix .alike piece of rubber, gutta-percha, or other similar elastic substance,G. The chisel, when in position in the holder, is held between andsupported by such two elastic or yielding surfaces. It will be readilyapparent that the chisel so held and supported can have and takesomemotion between such elastic or yielding surfaces independent of theholder or without affecting it. If, therefore, the blank to be outshould happen to be uneven in any degree upon its surface, the chisel asit is struck can at once accommodate itself to any such irregularitiesor unevenness of the surface of the blank, and the impression will be ofthe same width and depth throughout, whereas if the chisel were heldrigidly between the jaws or plates B and C it could not accommodateitself to any such irregularities of surface in the blank, and the cutor impression would, therefore, necessarily be more orless uneven, andthe cut face he more orless wanti ngin uniformity. The use andapplication of the elastic substance in the chisel-holder also greatlylessens and almost entirely destroys the shock produced by thecontinuous blows of the hammer upon the chisel, thereby insuringincreased steadiness to the whole machinery and greater accuracy to theaction of the chisel.

WVhat I claim as my invention, and desire to secure by Letters Patent,is-

Clamping the chisel between two disks of india-ruhber or gutta-percha bymeans of the set-screw D, or its equivalent, substantially as and forthe purposes set forth.

JOHN RUSSELL.

WVitnesses S. D. LAW, W. R. RONALDS.

